Exhalation valve filter



FIG. 1 is a perspective view, showing the new design for an exhalation valve filter.

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof, the left side view being a mirror image thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing in FIGS. 1-6 forms no part of the claimed design. The shading that is shown in the Figures, including the criss-cross pattern, is provided only to illustrate contour and is not indicative of any particular texture, etc. 

The ornamental design for an exhalation valve filter, as shown and described. 